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When raised to very high temperatures, many conventional liquid fuels dissociate into hydrogen and other components. Thus the advantage of a solid oxide fuel cell is that such a device can internally reformreadily available liquid fuels into hydrogen that can then be used to produce electrical power in a manner similar to Example 1.5. Consider a portable solid oxide fuel cell, operating at a temperature of Tfc = 800°C. The fuel cell aerogel (k = 0.006 W/m · K). The temperatures of the surroundings and the ambient are Tsur = 300 K andToo = 298 K, respectively. The outer surface is characterized by a convective heat transfer coeffi- cient of h = 12 W/m2 · K.
(b) Calculate the outer surface temperature of the can- ister for the four cases (high and low thermal con- ductivity; high and low surface emissivity).
(c) Calculate the heat loss from the cylindrical walls of the canister for the four cases.
Assuming the average rate of heat dissipation from people in an exercise room is 525 W determine the rate of heat gain of the exercise room from people and the equipment at peak load conditions.
Determine the effects of two-dimensional and three dimensional loading on the dimensions of a given material and determine the stresses and strains in the three dimensions of the steel plate
suppose air as an ideal gas satisfying the thermodynamic version of bernouillis equation flows down a pipe of radius r.
water is pump from a lake to a storage tank at 18m above at a rate of 70 L/s while consuming 20.4 kW of electric power. disregarding any frictional losses in the pipes and any change s in kinetic energy, determine (a) the overall efficiency of the..
Movement of stagnant air over a surface typically decreases the pressure that air exerts on the surface it was in contact with, and higher air velocities usually result in more significant pressure drops. This pressure drop from rapidly moving air ac..
Create a window apllication in java
why does turbulent flow distribution adhere more closely to the idealization of one dimensional flow than laminar flow?
determine the velocity of ship in sea water and also the resistance in sea water if density of air 1.3 kg/m and kinematic viscosity of sea water and air as 0.012 and 0.018 stokes respectively.
The 2 kg ball is releast from rest in position 1 with the string horizontal. The length of the string is L =2m and theta 40 degree. The ball's velocity when it is in position 2? The tensional force of the string is in position 2?
A piston-cylinder contains 0.1 kg of superheated steam at 180?C and 5.0 bars. The piston is frictionless and freely floating. Heat is added until the final volume is twice the initial volume. What is the work done on or by the steam?
Consider how dislocation intersections affect the stress necessary to continue slip. Let the density of screw dislocations be ρ (meters of dislocations/m3) and for simplicity assume that these dislocations are equally divided into three sets of dis..
an earthen channel n0.03 has a bed width of 5.0 m a water depth h 1.5 m a 45deg side slope and a channel slope of
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